Use mojo for Chrome Loading, Part 1

content/browser/loader/resource_message_filter.h

Index: content/browser/loader/resource_message_filter.h
diff --git a/content/browser/loader/resource_message_filter.h b/content/browser/loader/resource_message_filter.h
index d4c059a08cd4bd1e81a11d5a18a59a4307ca4905..e64a5c3a6aab17b4dbfb60fb675495ac4c359d77 100644
--- a/content/browser/loader/resource_message_filter.h
+++ b/content/browser/loader/resource_message_filter.h
@@ -10,8 +10,11 @@
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/sequenced_task_runner_helpers.h"
 #include "content/common/content_export.h"
+#include "content/common/url_loader.mojom.h"
 #include "content/public/browser/browser_message_filter.h"
+#include "content/public/browser/browser_thread.h"
 #include "content/public/common/resource_type.h"
 
 namespace storage {
@@ -28,6 +31,7 @@ class ChromeAppCacheService;
 class ChromeBlobStorageContext;
 class ResourceContext;
 class ServiceWorkerContextWrapper;
+struct GlobalRequestID;
 
 // This class filters out incoming IPC messages for network requests and
 // processes them on the IPC thread.  As a result, network requests are not
@@ -59,6 +63,7 @@ class CONTENT_EXPORT ResourceMessageFilter : public BrowserMessageFilter {
   // BrowserMessageFilter implementation.
   void OnChannelClosing() override;
   bool OnMessageReceived(const IPC::Message& message) override;
+  void OnDestruct() const override;
 
   // |origin_pid| is only required for NPAPI plugin processes. Its value is
   // ignored otherwise.
@@ -89,6 +94,15 @@ class CONTENT_EXPORT ResourceMessageFilter : public BrowserMessageFilter {
   int child_id() const { return child_id_; }
   int process_type() const { return process_type_; }
 
+  // Call |OnStartLoadingResponseBody| for the URLLoaderClient associated with
+  // |id|.
+  void OnStartLoadingResponseBodyWithMojo(
+      const GlobalRequestID& id,
+      mojo::ScopedDataPipeConsumerHandle response_body);
+
+  // IPC::Sender
+  bool Send(IPC::Message* message) override;
+
   base::WeakPtr<ResourceMessageFilter> GetWeakPtr();
 
  protected:
@@ -96,6 +110,12 @@ class CONTENT_EXPORT ResourceMessageFilter : public BrowserMessageFilter {
   ~ResourceMessageFilter() override;
 
  private:
+  friend struct BrowserThread::DeleteOnThread<BrowserThread::IO>;
+  friend class base::DeleteHelper<ResourceMessageFilter>;
+
+  bool SendWithMojo(mojom::URLLoaderClient* client,
+                    const IPC::Message& message);
+
   // The ID of the child process.
   int child_id_;